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Numéro de publicationUS6122272 A
Type de publicationOctroi
Numéro de demandeUS 08/863,031
Date de publication19 sept. 2000
Date de dépôt23 mai 1997
Date de priorité23 mai 1997
État de paiement des fraisPayé
Numéro de publication08863031, 863031, US 6122272 A, US 6122272A, US-A-6122272, US6122272 A, US6122272A
InventeursMarek Tomaszewski, Ashok Chippa, Ethan Spiegel
Cessionnaire d'origineCisco Technology, Inc.
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Call size feedback on PNNI operation
US 6122272 A
Résumé
The invention provides a method and system for selecting routes in a switching network with resource reservation, such as an ATM network. A set of routes are periodically precomputed, so that routes are known between any sending node and any receiving node, subject to resource reservation requirements. Each incoming call has its resource requirements, such as call size, compared with a selected threshold, and if the requirements exceed the threshold, a route is dynamically recomputed for the call. Other aspects of routing may be responsive to the calls' resource requirements. For example, a ratio of required resources with quality-of-service restrictions to required resources without such restrictions may be used to determine whether to reject the call, responsive to the call's resource requirements. The call size may be compared against another selected threshold, and the decision to determine whether to use that ratio to reject the call may be made responsive to comparisons against one or both thresholds.
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Revendications(28)
What is claimed is:
1. A method, including the steps of
precomputing a set of routes in a switching network, said routes being between a plurality of sending nodes and a plurality of receiving nodes;
receiving a request for a virtual circuit at one of said sending nodes, said request including a designated receiving node;
examining a set of resource requirements for said request; and
choosing whether to dynamically compute a new route between said one sending node and said designated receiving node, responsive to whether any of said set of resource requirements exceeds a set of selected thresholds, said thresholds determined in response to a network parameter.
2. A method as in claim 1, wherein said switching network is an ATM network.
3. A method as in claim 1, wherein said request comprises an incoming call in a telephone network.
4. A method as in claim 1, wherein said resource requirements include a call size.
5. A method as in claim 1, wherein:
said resource requirements include a call size; and
said step of choosing includes the step of comparing said call size with a selected threshold.
6. A method, including the steps of
receiving a request for a virtual circuit in a switching network, said network having a plurality of sending nodes and a plurality of receiving nodes, said request being received at a sending node;
examining a set of resource requirements for said request; and
choosing whether to dynamically compute a ratio of required resources with quality-of-service restrictions to required resources without such restrictions, responsive to whether any of said resource requirements exceeds a set of selected thresholds, said thresholds determined in response to a network parameter.
7. A method as in claim 6, wherein said switching network is an ATM network.
8. A method as in claim 6, wherein said request comprises an incoming call in a telephone network.
9. A method as in claim 6, wherein said resource requirements include a call size.
10. A method as in claim 6, wherein:
said resource requirements include a call size; and
said step of choosing includes the step of comparing said call size with a selected threshold.
11. A method as in claim 6, comprising the step of determining whether to reject said request, responsive to said dynamically computed ratio.
12. A node in a switching network, said node including:
a periodic route determination mechanism configured to periodically precompute a set of routes in said switching network, said set of routes including a plurality of sending nodes and a plurality of receiving nodes;
a receiver mechanism configured to receive a request for a virtual circuit including a designated receiving node;
a determination mechanism configured to examine a set of resource requirements for said request received by the receiver mechanism; and
a decision mechanism configured to choose whether to dynamically compute a new route between said node and said designated receiving node, responsive to whether any of said set of resource requirements exceeds a set of selected thresholds, said thresholds determined in response to a network parameter.
13. The node of claim 12, wherein said switching network is an ATM network.
14. The node of claim 12, wherein said request comprises an incoming call in a telephone network.
15. The node of claim 12, wherein said resource requirements include a call size.
16. The node of claim 12, wherein:
said resource requirements include a call size; and
the decision mechanism includes a comparison mechanism configured to compare said call size with a selected threshold.
17. A system including:
a switching network having a plurality of sending nodes and a plurality of receiving nodes, one of said plurality of sending nodes being a designated sending node and one of said plurality of receiving nodes being a designated receiving node;
a receiver mechanism configured to receive a request for a virtual circuit on said network, said receiver mechanism in communication with at least one of said designated sending node and said designated receiving node;
a determination mechanism configured to examine a set of resource requirements for said request, said determination mechanism in communication with the receiver mechanism; and
a decision mechanism configured to choose whether to dynamically compute a ratio of required resources with quality-of-service restrictions to required resources without such restrictions, responsive to whether any of said resource requirements exceeds a set of selected thresholds, said thresholds determined in response to a network parameter, said decision mechanism in communication with said determination mechanism.
18. The system of claim 17, wherein said switching network is an ATM network.
19. The system of claim 17, wherein said request comprises an incoming call in a telephone network.
20. The system of claim 17, wherein said resource requirements include a call size.
21. The system of claim 17, wherein
said resource requirements include a call size; and
the decision mechanism includes a comparison mechanism configured to compare said call size with a selected threshold.
22. The system of claim 17, further including a rejection mechanism configured to determine whether to reject said request, responsive to said dynamically computed ratio computed by the decision mechanism.
23. An object-oriented software system for selecting routes in a switching network with resource reservation said software system comprising:
an object for receiving a request for a virtual circuit in a switching network, said network having a plurality of sending nodes and a plurality of receiving nodes, said request being received at a sending node;
an object for examining a set of resource requirements for said request; and
an object for choosing whether to dynamically compute a ratio of required resources with quality-of-service restrictions to required resources without such restrictions, responsive to whether any of said resource requirements exceeds a set of selected thresholds, said thresholds determined in response to a network parameter;
wherein a set of actions carried out in operation of said software system are as depicted in the flow diagram of FIG. 1.
24. A software system as in claim 23, wherein said switching network is an ATM network.
25. A software system as in claim 23, wherein said request comprises an incoming call in a telephone network.
26. A software system as in claim 23, wherein said resource requirements include a call size.
27. A software system as in claim 23, wherein
said resource requirements include a call size; and
said step of choosing includes the step of comparing said call size with a selected threshold.
28. A software system as in claim 23, comprising the step of determining whether to reject said request, responsive to said dynamically computed ratio.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to ATM networks.

2. Related Art

In known ATM systems, different calls can have different requirements for transmission bandwidth. The transmission bandwidth requirement for a call is termed its "size." For example, a videoconference call is considered "larger" than a simple voice call. When selecting a virtual circuit for routing each call in an ATM network, the size of the call is considered in determining which switching nodes to select for routing each call or which through, or if the call should be rejected due to a lack of transmission capacity.

Known ATM systems determine the route for the virtual circuit for each incoming call as the call enters the ATM network. However, one problem which has arisen in the art is that this operation requires substantial computation. Accordingly, while this method achieves the goal of determining the virtual circuit for each incoming call, it has the drawback of requiring substantial resources for computation, can delay processing of incoming calls, and can therefore result in lesser throughput of incoming calls by the ATM system.

One technique to reduce the computation intensity associated with route computation is to use precomputed routes. However, precomputed routes can produce paths that are less efficient from the point of view of bandwidth utilization than routes computed dynamically. It would be advantageous to dynamically route those calls which might have a significant impact on overall bandwidth utilization in the network.

Accordingly, it would be desirable to provide a method and system for selecting routes in an ATM network, which does not require excessive dynamic route computation. This advantage is achieved in an embodiment of the invention in which most routes are precomputed, but some routes are dynamically computed in response to call size, thus call size is used to determine or help determine whether a dynamically computed route should be used instead of a precomputed route.

SUMMARY OF INVENTION

The invention provides a method and system for selecting routes in a switching network with resource reservation, such as an ATM network. A set of routes are periodically precomputed, so that routes are known between any sending node and any receiving node, subject to resource reservation requirements (such as call size). Each incoming call has its resource requirements, such as call size, compared with a selected threshold, and if the requirements exceed the threshold, a route is dynamically recomputed for the call.

In alternative embodiments, other aspects of routing may also be responsive to the calls' resource requirements (such as call size). For example, a ratio of required resources with quality-of-service restrictions to required resources without such restrictions may be used to determine whether to reject the call, responsive to the call's resource requirements. In such alternative embodiments, the call size may be compared against another selected threshold, and the decision to determine whether to use that ratio to reject the call may be made responsive to comparisons against one or both thresholds.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a process flow diagram of a method for selecting routes in a switching network.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In the following description, a preferred embodiment of the invention is described with regard to preferred process steps and data structures. Those skilled in the art would recognize after perusal of this application that embodiments of the invention can be implemented using general purpose switching processors or special purpose switching processors or other circuits adapted to particular process steps and data structures described herein, and that implementation of the process steps and data structures described herein would not require undue experimentation or further invention.

Inventions described herein can be used in conjunction with inventions described in the following application:

Application Ser. No. 08/862,915, filed May 23, 1997, Express Mailing No. EM302071674, in the name of the same inventors, titled "Next Hop Selection in ATM Networks", having attorney docket number CIS-025.

This application is hereby incorporated by reference as if fully set forth herein.

Precomputed Routes or Dynamic Recomputation

FIG. 1 shows a process flow diagram of a method for selecting routes in a switching network.

A method 100 for selecting routes in a switching network includes the flow points 110 through 170, and steps therebetween. The method 100 is preferably performed in a switching network with resource reservation, such as an ATM network.

At a flow point 110, the switching network includes a set of nodes, including at least one sending node, at least one receiving node, and a plurality of routes between the sending nodes and the receiving nodes.

At a step 121, the method 100 precomputes a set of routes between each of the sending nodes and each of the receiving nodes, subject to resource reservation requirements.

The step 121 is periodically performed, so that precomputed routes are known between any of the sending nodes and any of the receiving nodes, and the routes which are known are subject to resource reservation requirements.

As used herein, the concept of "precomputed" routes includes schemes in which a set of routes, or a set of preferred routes, are determined independent of parameters of the call. This includes cases where some precomputed routes are in fact computed or partially computed at or near the time the call arrives, but are determined independent of parameters of the call such as call size. A fixed technique for determining a preferred route is a precomputed route, while a technique or selection among techniques which is responsive to the call size and determines different routes for calls having different sizes (as opposed to merely rejecting calls which are too large) is not a precomputed route.

At a flow point 130, an incoming call arrives at one of the sending nodes. The incoming call includes a designated receiving node and a set of resource requirements. For example, one such resource requirement is a call size for the incoming call.

The incoming call is preferably an incoming call in a telephone network to be routed using the ATM network.

At a step 141, the call size for the incoming call is compared with a first selected threshold. In a preferred embodiment, the first selected threshold is a static value set by an operator using a network management system for a peer group in the ATM network. For example, the static value may comprise a value such as about 1 megabit per second, or a value such as about 384 kilobits per second, so as to distinguish between ordinary voice telephone calls and videotelephone calls. In alternative embodiments, the first selected threshold may be dynamically determined in response to traffic in the ATM network or other factors. For example, the first selected threshold may be determined in response to the number and type of call requests received, so as to approximately limit the number of calls for which routes are dynamically computed to a selected limit.

At a step 142, if the call size for the incoming call exceeds the first selected threshold, the method 100 dynamically recomputes a route for the call (thus disregarding the precomputed routes). Otherwise, the method 100 does not perform the step 142.

Call Rejection For Excessive Resource Usage

At a step 143, the call size for the incoming call is compared with a second selected threshold. In a preferred embodiment, the second selected threshold is a static value; however, in alternative embodiments, the second selected threshold may be determined responsive to traffic in the ATM network or other factors, in similar manner as the first selected threshold is determined in the step 141.

At a step 144, if the call size for the incoming call does not exceed the second selected threshold, the method 100 continues with the flow point 150. Otherwise, the method 100 proceeds to determine an excess-usage ratio of required resources with quality-of-service restrictions to required resources without such restrictions.

To determine the ratio in the step 144, the method 100 performs the following sub-steps:

At a sub-step 144(a), the method 100 determines a first route for the incoming call without using quality of service restrictions.

At a sub-step 144(b), the method 100 determines a first weighted hop count n0 for the first route.

In a preferred embodiment, the first weighted hop count is computed by assigning a relatively lower administrative cost to relatively higher-speed interfaces. For example, the administrative cost for a hop can be inversely proportional to the total Maximum Cell Rate of interfaces available for that hop.

At a sub-step 144(c), the method 100 determines a second route for the incoming call, this time using quality of service restrictions.

The second route can require different switching nodes and can require more switching nodes than the first route, because quality of service restrictions restrict the nature of the interfaces through which the call can pass.

At a sub-step 144(d), the method 100 determines a second weighted hop count n1 for the second route.

In a preferred embodiment, the second weighted hop count is determined in like manner as the first weighted hop count. Thus, the second weighted hop count is computed by assigning a relatively lower administrative cost to relatively higher-speed interfaces.

At a sub-step 144(e), the method 100 determines the excess-usage ratio n1/n0.

At a step 145, if the excess-usage ratio n1/n0 determined in the step 144 exceeds a third selected threshold, the method 100 rejects the call.

In a preferred embodiment, the third selected threshold is a static value; however, in alternative embodiments, the third selected threshold may be determined responsive to traffic in the ATM network or other factors, in similar manner as the first selected threshold is determined in the step 141. In a preferred embodiment, the third selected threshold is an excess-usage ratio of about 1.5 to 1 for a relatively dense network, or about 2 or 3 to 1 for a relatively sparse network.

At a flow point 150, a route is known for the incoming call.

At a step 161, the incoming call is routed according to the known route.

At a flow point 170, the method 100 is complete.

Further Applicability of Resource Requirement Feedback

The resource requirements of the incoming call has broader applicability than determining (a) whether to dynamically recompute routes, or (b) whether to dynamically determine an excess-usage ratio and reject incoming calls responsive thereto.

For example, the method 100 can determine, responsive to the resources required by the incoming call (such as call size), whether to apply techniques relating to one or more of the following:

In a dynamic path recomputation protocol, such as in virtual path and virtual circuit recomputation, the call size can be used to determine for which calls to determine whether to reroute paths. For example, paths can be dynamically rerouted only for those calls which are large enough to make a significant difference.

In a system which transmits multicast information, the call size can be used to determine for which point to multipoint calls to attempt to optimize (or partially reoptimize) the multicast routing tree. Similarly, in a system which transmits multicast information and also receives point to point calls, the call size can be used to determine for which newly arrived calls to trigger an attempt to optimize (or partially reoptimize) multicast routing trees.

In other routing protocols which concern or involve dynamic path computation or resource reservation, the call size can be used to determine for which calls to attempt to perform dynamic path computation or resource reservation.

Alternative Embodiments

Although preferred embodiments are disclosed herein, many variations are possible which remain within the concept, scope, and spirit of the invention, and these variations would become clear to those skilled in the art after perusal of this application.

Citations de brevets
Brevet cité Date de dépôt Date de publication Déposant Titre
US33900 *10 déc. 1861 Improvement in military hats
US4131767 *22 févr. 197826 déc. 1978Bell Telephone Laboratories, IncorporatedEcho cancellation in two-wire, two-way data transmission systems
US4161719 *4 oct. 197717 juil. 1979Ncr CorporationSystem for controlling synchronization in a digital communication system
US4316284 *11 sept. 198016 févr. 1982Bell Telephone Laboratories, IncorporatedFrame resynchronization circuit for digital receiver
US4397020 *13 oct. 19812 août 1983Bell Telephone Laboratories, IncorporatedError monitoring in digital transmission systems
US4419728 *22 juin 19816 déc. 1983Bell Telephone Laboratories, IncorporatedChannel interface circuit providing virtual channel number translation and direct memory access
US4424565 *22 juin 19813 janv. 1984Bell Telephone Laboratories, IncorporatedChannel interface circuit with high speed data message header field translation and direct memory access
US4437087 *27 janv. 198213 mars 1984Bell Telephone Laboratories, IncorporatedAdaptive differential PCM coding
US4438511 *10 nov. 198020 mars 1984Telebit CorporationPacketized ensemble modem
US4439763 *3 sept. 198127 mars 1984Bell Telephone Laboratories, IncorporatedCollision avoiding system and protocol for a multiple access digital communications system
US4445213 *22 janv. 198224 avr. 1984Bell Telephone Laboratories, IncorporatedCommunication line interface for controlling data information having differing transmission characteristics
US4446555 *22 févr. 19821 mai 1984Michel DevaultTime division multiplex switching network for multiservice digital networks
US4456957 *28 sept. 198126 juin 1984Ncr CorporationApparatus using a decision table for routing data among terminals and a host system
US4464658 *5 mars 19827 août 1984At&T LaboratoriesMultipoint data communication system with collision detection
US4499576 *13 août 198212 févr. 1985At&T Bell LaboratoriesMultiplexed first-in, first-out queues
US4506358 *25 juin 198219 mars 1985At&T Bell LaboratoriesTime stamping for a packet switching system
US4507760 *13 août 198226 mars 1985At&T Bell LaboratoriesFirst-in, first-out (FIFO) memory configuration for queue storage
US4532626 *19 juil. 198230 juil. 1985At&T Bell LaboratoriesCollision avoiding system and protocol for a two path multiple access digital communications system
US4644532 *10 juin 198517 févr. 1987International Business Machines CorporationAutomatic update of topology in a hybrid network
US4646287 *7 déc. 198424 févr. 1987At&T Bell LaboratoriesIdle period signalling in a packet switching system
US4677423 *6 janv. 198630 juin 1987American Telephone & Telegraph, At&T Bell LaboratoriesADPCM coder-decoder including partial band energy transition detection
US4679189 *27 nov. 19857 juil. 1987American Telephone And Telegraph CompanyAlternate routing arrangement
US4679227 *20 mai 19857 juil. 1987Telebit CorporationEnsemble modem structure for imperfect transmission media
US4723267 *17 juin 19852 févr. 1988Octocom Systems, Inc.Telephone line interface and dialer circuitry for telecommunications equipment
US4731816 *12 janv. 198715 mars 1988Telebit CorporationEnsemble modem structure for imperfect transmission media
US4750136 *10 janv. 19867 juin 1988American Telephone And Telegraph, At&T Information Systems Inc.Communication system having automatic circuit board initialization capability
US4757495 *5 mars 198612 juil. 1988Telebit CorporationSpeech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels
US4763191 *17 mars 19869 août 1988American Telephone And Telegraph Company, At&T Bell LaboratoriesDial-up telephone network equipment for requesting an identified selection
US4769810 *31 déc. 19866 sept. 1988American Telephone And Telegraph Company, At&T Bell LaboratoriesPacket switching system arranged for congestion control through bandwidth management
US4769811 *31 déc. 19866 sept. 1988American Telephone And Telegraph Company, At&T Bell LaboratoriesPacket switching system arranged for congestion control
US4771425 *29 oct. 198413 sept. 1988Stratacom, Inc.Synchoronous packet voice/data communication system
US4819228 *15 oct. 19874 avr. 1989Stratacom Inc.Synchronous packet voice/data communication system
US4827411 *15 juin 19872 mai 1989International Business Machines CorporationMethod of maintaining a topology database
US4833706 *5 janv. 198823 mai 1989Telebit CorporationEnsemble modem structure for imperfect transmission media
US4835737 *21 juil. 198630 mai 1989American Telephone And Telegraph Company, At&T Bell LaboratoriesMethod and apparatus for controlled removal and insertion of circuit modules
US4879551 *26 avr. 19857 nov. 1989International Business Machines CorporationSwitching array with concurrent marking capability
US4893306 *10 nov. 19879 janv. 1990Bell Communications Research, Inc.Method and apparatus for multiplexing circuit and packet traffic
US4903261 *9 mars 198820 févr. 1990Stratacom, Inc.Synchronous packet voice/data communication system
US4922486 *31 mars 19881 mai 1990American Telephone And Telegraph CompanyUser to network interface protocol for packet communications networks
US4933937 *23 nov. 198712 juin 1990Kabushiki Kaisha ToshibaNetwork adapter for connecting local area network to backbone network
US4960310 *4 août 19892 oct. 1990Optical Corporation Of AmericaBroad band nonreflective neutral density filter
US4962497 *21 sept. 19899 oct. 1990At&T Bell LaboratoriesBuilding-block architecture of a multi-node circuit-and packet-switching system
US4962532 *22 déc. 19889 oct. 1990Ibm CorporationMethod for providing notification of classified electronic message delivery restriction
US4965772 *15 juin 198723 oct. 1990International Business Machines CorporationMethod and apparatus for communication network alert message construction
US4970678 *28 juin 198813 nov. 1990International Business Machines CorporationSystem for providing context-sensitive on-line documentation in a data processor
US4979118 *10 mars 198918 déc. 1990Gte Laboratories IncorporatedPredictive access-control and routing system for integrated services telecommunication networks
US4980897 *12 août 198825 déc. 1990Telebit CorporationMulti-channel trellis encoder/decoder
US4991169 *2 août 19885 févr. 1991International Business Machines CorporationReal-time digital signal processing relative to multiple digital communication channels
US5003595 *29 août 198926 mars 1991At&T Bell LaboratoriesSecure dial access to computer systems
US5014265 *30 nov. 19897 mai 1991At&T Bell LaboratoriesMethod and apparatus for congestion control in a data network
US5020058 *23 janv. 198928 mai 1991Stratacom, Inc.Packet voice/data communication system having protocol independent repetitive packet suppression
US5033076 *31 janv. 199016 juil. 1991At&T Bell LaboratoriesEnhanced privacy feature for telephone systems
US5054034 *15 juin 19891 oct. 1991Telebit CorporationEnsemble modem structure for imperfect transmission media
US5059925 *28 sept. 199022 oct. 1991Stratacom, Inc.Method and apparatus for transparently switching clock sources
US5072449 *15 févr. 199010 déc. 1991Stratacom, Inc.Packet framing using cyclic redundancy checking
US5088032 *29 janv. 198811 févr. 1992Cisco Systems, Inc.Method and apparatus for routing communications among computer networks
US5095480 *16 juin 198910 mars 1992Fenner Peter RMessage routing system for shared communication media networks
US5115431 *28 sept. 199019 mai 1992Stratacom, Inc.Method and apparatus for packet communications signaling
US5128945 *31 oct. 19917 juil. 1992Stratacom, Inc.Packet framing using cyclic redundancy checking
US5136580 *16 mai 19904 août 1992Microcom Systems, Inc.Apparatus and method for learning and filtering destination and source addresses in a local area network system
US5166930 *17 déc. 199024 nov. 1992At&T Bell LaboratoriesData channel scheduling discipline arrangement and method
US5199049 *27 avr. 199030 mars 1993At&T Bell LaboratoriesCircuit and method of digital carrier detection for burst mode communication systems
US5206886 *16 avr. 199027 avr. 1993Telebit CorporationMethod and apparatus for correcting for clock and carrier frequency offset, and phase jitter in mulicarrier modems
US5208811 *1 nov. 19904 mai 1993Hitachi, Ltd.Interconnection system and method for heterogeneous networks
US5212686 *29 sept. 198918 mai 1993Plessey Overseas LimitedAsynchronous time division switching arrangement and a method of operating same
US5224099 *17 mai 199129 juin 1993Stratacom, Inc.Circuitry and method for fair queuing and servicing cell traffic using hopcounts and traffic classes
US5226120 *21 mai 19906 juil. 1993Synoptics Communications, Inc.Apparatus and method of monitoring the status of a local area network
US5228062 *27 mai 199213 juil. 1993Telebit CorporationMethod and apparatus for correcting for clock and carrier frequency offset, and phase jitter in multicarrier modems
US5229994 *27 sept. 199120 juil. 1993Alcatel CitBridge for connecting an ieee 802.3 local area network to an asynchronous time-division multiplex telecommunication network
US5233604 *28 avr. 19923 août 1993International Business Machines CorporationMethods and apparatus for optimum path selection in packet transmission networks
US5237564 *5 avr. 199117 août 1993France TelecomFrame switching relay for asynchronous digital network
US5241682 *18 avr. 199131 août 1993International Business Machines CorporationBorder node having routing and functional capability in a first network and only local address capability in a second network
US5243342 *22 juil. 19927 sept. 1993Stratacom, Inc.Integrated PCM level control and conversion using a lookup table
US5243596 *18 mars 19927 sept. 1993Fischer & Porter CompanyNetwork architecture suitable for multicasting and resource locking
US5247516 *28 mars 199121 sept. 1993Sprint International Communications Corp.Configurable composite data frame
US5249178 *26 juil. 199128 sept. 1993Nec CorporationRouting system capable of effectively processing routing information
US5253251 *8 janv. 199212 oct. 1993Nec CorporationSwitching system with time-stamped packet distribution input stage and packet sequencing output stage
US5255291 *14 nov. 198819 oct. 1993Stratacom, Inc.Microprocessor based packet isochronous clocking transmission system and method
US5260933 *15 mai 19929 nov. 1993International Business Machines CorporationAcknowledgement protocol for serial data network with out-of-order delivery
US5260978 *30 oct. 19929 nov. 1993Bell Communications Research, Inc.Synchronous residual time stamp for timing recovery in a broadband network
US5268592 *26 févr. 19917 déc. 1993International Business Machines CorporationSequential connector
US5268900 *5 juil. 19917 déc. 1993Codex CorporationDevice and method for implementing queueing disciplines at high speeds
US5271004 *27 août 199114 déc. 1993Gpt LimitedAsynchronous transfer mode switching arrangement providing broadcast transmission
US5274631 *11 mars 199128 déc. 1993Kalpana, Inc.Computer network switching system
US5274635 *18 nov. 199228 déc. 1993Stratacom, Inc.Method and apparatus for aligning a digital communication data stream across a cell network
US5274643 *11 déc. 199228 déc. 1993Stratacom, Inc.Method for optimizing a network having virtual circuit routing over virtual paths
US5280470 *3 févr. 199318 janv. 1994At&T Bell LaboratoriesBandwidth and congestion management in accessing broadband ISDN networks
US5280480 *21 févr. 199118 janv. 1994International Business Machines CorporationSource routing transparent bridge
US5280500 *10 oct. 199118 janv. 1994Crescendo Communications, Inc.Method and apparatus for multilevel encoding for a local area network
US5283783 *28 janv. 19931 févr. 1994Synoptics Communications, Inc.Apparatus and method of token ring beacon station removal for a communication network
US5287103 *30 déc. 199115 févr. 1994At&T Bell LaboratoriesMethod and apparatus for providing local area network clients with internetwork identification data
US5287453 *18 sept. 199015 févr. 1994Bull Hn Information Systems, Inc.Fast remote file access facility for distributing file access requests in a closely coupled computer system
US5289462 *19 août 199222 févr. 1994International Business Machines Corp.Traffic management in packet communications networks
US5291482 *24 juil. 19921 mars 1994At&T Bell LaboratoriesHigh bandwidth packet switch
US5305311 *20 mai 199219 avr. 1994Xerox CorporationCopy network providing multicast capabilities in a broadband ISDN fast packet switch suitable for use in a local area network
US5307343 *27 nov. 199026 avr. 1994Italtel Societa Italiana Telecommunicazioni S.P.A.Basic element for the connection network of a fast packet switching node
US5309437 *29 juin 19903 mai 1994Digital Equipment CorporationBridge-like internet protocol router
US5311509 *6 févr. 199210 mai 1994International Business Machines CorporationConfigurable gigabits switch adapter
US5313454 *1 avr. 199217 mai 1994Stratacom, Inc.Congestion control for cell networks
US5313582 *30 avr. 199117 mai 1994Standard Microsystems CorporationMethod and apparatus for buffering data within stations of a communication network
US53175627 mai 199331 mai 1994Stratacom, Inc.Method and apparatus for routing cell messages using delay
US531964421 août 19927 juin 1994Synoptics Communications, Inc.Method and apparatus for identifying port/station relationships in a network
US53274216 nov. 19925 juil. 1994At&T Bell LaboratoriesApparatus for interfacing between telecommunications call signals and broadband signals
US533163730 juil. 199319 juil. 1994Bell Communications Research, Inc.Multicast routing using core based trees
US53454456 nov. 19926 sept. 1994At&T Bell LaboratoriesEstablishing telecommunications calls in a broadband network
US53454466 nov. 19926 sept. 1994At&T Bell LaboratoriesEstablishing telecommunications call paths in broadband communication networks
US535750724 août 199318 oct. 1994Northern Telecom LimitedFast connection admission control for ATM networks
US535959225 juin 199325 oct. 1994Stratacom, Inc.Bandwidth and congestion control for queue channels in a cell switching communication controller
US53612503 nov. 19931 nov. 1994Synoptics Communications, Inc.Apparatus and method of token ring beacon station removal for a communication network
US536125627 mai 19931 nov. 1994International Business Machines CorporationInter-domain multicast routing
US536125919 févr. 19931 nov. 1994American Telephone And Telegraph CompanyWide area network (WAN)-arrangement
US53655246 nov. 199215 nov. 1994At&T Bell LaboratoriesEstablishing telecommunications call paths between clustered switching entities
US536751716 déc. 199222 nov. 1994International Business Machines CorporationMethod and system of requesting resources in a packet-switched network with minimal latency
US537185214 oct. 19926 déc. 1994International Business Machines CorporationMethod and apparatus for making a cluster of computers appear as a single host on a network
US538656714 oct. 199231 janv. 1995International Business Machines Corp.Hot removable and insertion of attachments on fully initialized computer systems
US539017029 juin 199314 févr. 1995Synoptics Communications, Inc.Method and apparatus providing for bootstrapping of switches in an ATM network or the like
US539017520 déc. 199314 févr. 1995At&T CorpInter-cell switching unit for narrow band ATM networks
US539439424 juin 199328 févr. 1995Bolt Beranek And Newman Inc.Message header classifier
US539440210 juin 199428 févr. 1995Ascom Timeplex Trading AgHub for segmented virtual local area network with shared media access
US540032529 juin 199321 mars 1995Synoptics Communications, Inc.Method and apparatus providing for hunt groups in an ATM network of the like
US540846922 juil. 199318 avr. 1995Synoptics Communications, Inc.Routing device utilizing an ATM switch as a multi-channel backplane in a communication network
US541684210 juin 199416 mai 1995Sun Microsystems, Inc.Method and apparatus for key-management scheme for use with internet protocols at site firewalls
US54228805 avr. 19936 juin 1995Stratacom, Inc.Broadband switching fabric in a communication controller
US542288220 déc. 19936 juin 1995At&T Corp.ATM networks for narrow band communications
US542300228 févr. 19946 juin 19953Com CorporationSystem for extending network resources to remote networks
US542663620 déc. 199320 juin 1995At&T Corp.ATM distribution networks for narrow band communications
US542860720 déc. 199327 juin 1995At&T Corp.Intra-switch communications in narrow band ATM networks
US543071515 sept. 19934 juil. 1995Stratacom, Inc.Flexible destination address mapping mechanism in a cell switching communication controller
US54307294 avr. 19944 juil. 1995Motorola, Inc.Method and apparatus for adaptive directed route randomization and distribution in a richly connected communication network
US544245711 janv. 199315 août 1995Najafi; HamidMulti-line pooling facsimile apparatus
US544263025 mai 199115 août 1995Gagliardi; Ugo O.ISDN interfacing of local area networks
US545229720 déc. 199319 sept. 1995At&T Corp.Access switches for large ATM networks
US547359922 avr. 19945 déc. 1995Cisco Systems, IncorporatedStandby router protocol
US54736079 août 19935 déc. 1995Grand Junction Networks, Inc.Packet filtering for data networks
US548545528 janv. 199416 janv. 1996Cabletron Systems, Inc.Network having secure fast packet switching and guaranteed quality of service
US549014030 sept. 19946 févr. 1996International Business Machines CorporationSystem and method for providing ATM support for frame relay DTEs with a terminal adapter
US549025829 sept. 19926 févr. 1996Fenner; Peter R.Associative memory for very large key spaces
US549168728 sept. 199413 févr. 1996International Business Machines CorporationMethod and system in a local area network switch for dynamically changing operating modes
US54918044 janv. 199113 févr. 1996International Business Machines Corp.Method and apparatus for automatic initialization of pluggable option cards
US549736815 août 19945 mars 1996Koninklijke Ptt Nederland N.V.Routing method for a hierarchical communications network, and a hierarchical communications network having improved routing
US55047473 mars 19932 avr. 1996Apple Computer, Inc.Economical payload stream routing in a multiple-ring network
US550900618 avr. 199416 avr. 1996Cisco Systems IncorporatedApparatus and method for switching packets using tree memory
US551749430 sept. 199414 mai 1996Apple Computer, Inc.Method and system of multicast routing for groups with a single transmitter
US551970421 avr. 199421 mai 1996Cisco Systems, Inc.Reliable transport protocol for internetwork routing
US551985810 janv. 199221 mai 1996Digital Equipment CorporationAddress recognition engine with look-up database for storing network information
US552648919 mars 199311 juin 19963Com CorporationSystem for reverse address resolution for remote network device independent of its physical address
US553096316 déc. 199325 juin 1996International Business Machines CorporationMethod and system for maintaining routing between mobile workstations and selected network workstation using routing table within each router device in the network
US55351956 mai 19949 juil. 1996Motorola, Inc.Method for efficient aggregation of link metrics
US553973421 juil. 199423 juil. 1996Newbridge Networks CorporationMethod of maintaining PVC status packetized communication system
US554191112 oct. 199430 juil. 19963Com CorporationRemote smart filtering communication management system
US554637029 juil. 199413 août 1996Olympus Optical Co., Ltd.Compact apparatus having bidirectional motion for loading/unloading an information recording medium
US555524430 juin 199410 sept. 1996Integrated Network CorporationScalable multimedia network
US556166926 oct. 19941 oct. 1996Cisco Systems, Inc.Computer network switching system with expandable number of ports
US558386228 mars 199510 déc. 1996Bay Networks, Inc.Method and apparatus for routing for virtual networks
US559247021 déc. 19947 janv. 1997At&TBroadband wireless system and network architecture providing broadband/narrowband service with optimal static and dynamic bandwidth/channel allocation
US55985816 août 199328 janv. 1997Cisco Sytems, Inc.Variable latency cut through bridge for forwarding packets in response to user's manual adjustment of variable latency threshold point while the bridge is operating
US560079826 oct. 19934 févr. 1997International Business Machines CorporationSystem and method for controlling LAN data flow control through a frame relay network by end point station transmitting notification to LAN stations based on congestion notification from the frame relay network
US560486825 juin 199118 févr. 1997Fujitsu LimitedCommunication system using establishing network route
US560872625 avr. 19954 mars 1997Cabletron Systems, Inc.Network bridge with multicast forwarding table
US56174177 sept. 19941 avr. 1997Stratacom, Inc.Asynchronous transfer mode communication in inverse multiplexing over multiple communication links
US561742117 juin 19941 avr. 1997Cisco Systems, Inc.Extended domain computer network using standard links
US563012523 mai 199413 mai 1997Zellweger; PaulMethod and apparatus for information management using an open hierarchical data structure
US563190828 mars 199520 mai 1997Digital Equipment CorporationMethod and apparatus for generating and implementing smooth schedules for forwarding data flows across cell-based switches
US563202125 oct. 199520 mai 1997Cisco Systems Inc.Computer system with cascaded peripheral component interconnect (PCI) buses
US563401021 oct. 199427 mai 1997Modulus Technologies, Inc.Managing and distributing data objects of different types between computers connected to a network
US564471810 nov. 19941 juil. 1997At&T CorporationApparatus using circuit manager to associate a single circuit with each host application where the circuit is shared by a plurality of client applications
US566635321 mars 19959 sept. 1997Cisco Systems, Inc.Frame based traffic policing for a digital switch
US567326529 avr. 199630 sept. 1997Integrated Network CorporationScalable multimedia network
US56780061 févr. 199614 oct. 1997Cisco Systems, Inc.Network switch having network management agent functions distributed among multiple trunk and service modules
US568011622 déc. 199421 oct. 1997Nec CorporationStatic routing system
US568479725 oct. 19954 nov. 1997International Business Machines CorporationATM cell multicasting method and apparatus
US56873248 nov. 199511 nov. 1997Advanced Micro Devices, Inc.Method of and system for pre-fetching input cells in ATM switch
US568949928 mars 199418 nov. 1997Curtin University Of TechnologyMethod and apparatus for managing the statistical multiplexing of data in digital communication networks
US568950616 janv. 199618 nov. 1997Lucent Technologies Inc.Multicast routing in multistage networks
US571986411 août 199517 févr. 1998International Business Machines Corp.Logical channel resolution in asynchronous transmission mode communication systems
US57243517 août 19953 mars 1998Chao; Hung-Hsiang JonathanScaleable multicast ATM switch
US57481862 oct. 19955 mai 1998Digital Equipment CorporationMultimodal information presentation system
US575454726 avr. 199619 mai 1998Nec CorporationRouting method and system using an internet protocol
US580205415 août 19961 sept. 19983Com CorporationAtomic network switch with integrated circuit switch nodes
US58549037 nov. 199529 déc. 1998Lucent Technologies Inc.Optimization method for routing and logical network design in multi-service networks
US585698115 mai 19975 janv. 1999Lucent Technologies Inc.Reliable connection oriented networks
US589292431 janv. 19966 avr. 1999Ipsilon Networks, Inc.Method and apparatus for dynamically shifting between routing and switching packets in a transmission network
US589868613 déc. 199627 avr. 1999Cabletron Systems, Inc.Network bridge with multicast forwarding table
US590355920 déc. 199611 mai 1999Nec Usa, Inc.Method for internet protocol switching over fast ATM cell transport
USRE3390031 juil. 198928 avr. 1992At&T Bell LaboratoriesError monitoring in digital transmission systems
Citations hors brevets
Référence
1Allen, M., "Novell IPX Over Various WAN Media (IPXW AN)," Network Working Group, RFC 1551, Dec. 1993, pp. 1-22.
2 *Allen, M., Novell IPX Over Various WAN Media (IPXW AN), Network Working Group, RFC 1551, Dec. 1993, pp. 1 22.
3Becker, D., "3c589.c: A 3c589 EtherLink3 ethernet driver for linux." becker@CESDIS.gsfc.nasa.gov, May 3, 1994, pp. 1-13.
4 *Becker, D., 3c589.c: A 3c589 EtherLink3 ethernet driver for linux. becker CESDIS.gsfc.nasa.gov, May 3, 1994, pp. 1 13.
5Chowdhury, et al., "Alternative Bandwidth Allocation Algorithms for Packet Video in ATM Networks," INFOCOM 1992, pp. 1061-1068.
6 *Chowdhury, et al., Alternative Bandwidth Allocation Algorithms for Packet Video in ATM Networks, INFOCOM 1992, pp. 1061 1068.
7Doeringer, W., "Routing on Longest-Matching Prefixes," IEEE/ACM Transactions in Networking, vol. 4, No. 1, Feb. 1996, pp. 86-97.
8 *Doeringer, W., Routing on Longest Matching Prefixes, IEEE/ACM Transactions in Networking, vol. 4, No. 1, Feb. 1996, pp. 86 97.
9Esaki, et al., "Datagram Delivery in an ATM-Internet," 2334b IEICE Transactions on Communications, Mar. 1994, No. 3, Tokyo, Japan.
10 *Esaki, et al., Datagram Delivery in an ATM Internet, 2334b IEICE Transactions on Communications, Mar. 1994, No. 3, Tokyo, Japan.
11IBM Corporation, "Method and Apparatus for the Statistical Multiplexing of Voice, Data and Image Signals," IBM Technical Disclosure Bulletin, No. 6, Nov. 1992, pp. 409-411.
12 *IBM Corporation, Method and Apparatus for the Statistical Multiplexing of Voice, Data and Image Signals, IBM Technical Disclosure Bulletin, No. 6, Nov. 1992, pp. 409 411.
13Pei, et al., "Putting Routing Tables in Silicon," IEEE Network Magazine, Jan. 1992, pp. 42-50.
14 *Pei, et al., Putting Routing Tables in Silicon, IEEE Network Magazine, Jan. 1992, pp. 42 50.
15Perkins, D., "Requirements for an Internet Standard Point-to-Point Protocol," Network Working Group, RFC 1547, Dec. 1993, pp. 1-19.
16 *Perkins, D., Requirements for an Internet Standard Point to Point Protocol, Network Working Group, RFC 1547, Dec. 1993, pp. 1 19.
17Simpson, W., "The Point-to-Point Protocol (PPP)," Network Working Group, RFC 1548, Dec. 1993, pp. 1-53.
18 *Simpson, W., The Point to Point Protocol (PPP), Network Working Group, RFC 1548, Dec. 1993, pp. 1 53.
19 *Stallings, Data and Computer Communications, PP:329 333, 1996.
20Stallings, Data and Computer Communications, PP:329-333, 1996.
21Tsuchiya, P.F., "A Search Algorithm for Table Entries with Non-contiguous Wildcarding," Abstract, Bellcore.
22 *Tsuchiya, P.F., A Search Algorithm for Table Entries with Non contiguous Wildcarding, Abstract, Bellcore.
23 *William Stallings, Data and Computer Communications, PP: 329 333, Prentice Hall, Upper Saddle River, New Jersey 07458.
24William Stallings, Data and Computer Communications, PP: 329-333, Prentice Hall, Upper Saddle River, New Jersey 07458.
25Zhang, et al., "Rate-Controlled Static-Priority Queueing," INFOCOM 1993, pp. 227-236.
26 *Zhang, et al., Rate Controlled Static Priority Queueing, INFOCOM 1993, pp. 227 236.
Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US637012129 juin 19989 avr. 2002Cisco Technology, Inc.Method and system for shortcut trunking of LAN bridges
US652949813 oct. 19984 mars 2003Cisco Technology, Inc.Routing support for point-to-multipoint connections
US6563798 *29 juin 199813 mai 2003Cisco Technology, Inc.Dynamically created service class-based routing tables
US660072428 avr. 199829 juil. 2003Cisco Technology, Inc.Routing table structures
US668765517 janv. 20023 févr. 2004Telefonaktiebolaget Lm Ericsson (Publ)Maintenance of sliding window aggregated state using combination of soft state and explicit release principles
US671792014 janv. 20036 avr. 2004Cisco Technology, Inc.Dynamically created service class-based routing tables
US686228417 juin 19971 mars 2005Cisco Technology, Inc.Format for automatic generation of unique ATM addresses used for PNNI
US707948817 mars 200118 juil. 2006Cisco Technology, Inc.Method and apparatus for modifying the bandwidth of an established ATM call in response to an identification of the contents of the call
US712696323 mai 200224 oct. 2006International Business Machines CorporationApparatus, method and computer program to reserve resources in communications system
US755820717 juil. 20067 juil. 2009Cisco Technology, Inc.Modifying the bandwidth of an established ATM call in response to an identification of the contents of the call
US766025420 févr. 20079 févr. 2010Cisco Technology, Inc.Optimization of distributed tunnel rerouting in a computer network with coordinated head-end node path computation
US769305520 févr. 20076 avr. 2010Cisco Technology, Inc.Optimization of distributed tunnel rerouting in a computer network with intermediate node feedback
US7719977 *18 avr. 200818 mai 2010Teknovus, Inc.Method and apparatus for dynamically allocating upstream bandwidth in passive optical networks
US782647616 août 20062 nov. 2010International Business Machines CorporationApparatus and method to reserve resources in communications system
US818948220 févr. 200729 mai 2012Cisco Technology, Inc.Probing-based mechanism to reduce preemption perturbation caused by higher priority tunnel establishment in a computer network
US830052717 mai 201030 oct. 2012Broadcom CorporationMethod and apparatus for dynamically allocating upstream bandwidth in passive optical networks
US836921320 févr. 20075 févr. 2013Cisco Technology, Inc.Optimization of distributed tunnel rerouting in a computer network with path computation at an intermediate node
US848976528 mai 201016 juil. 2013Cisco Technology, Inc.Dynamic directed acyclic graph (DAG) adjustment
US854784320 janv. 20061 oct. 2013Saisei Networks Pte LtdSystem, method, and computer program product for controlling output port utilization
US876753226 oct. 20121 juil. 2014Cisco Technology, Inc.Optimization of distributed tunnel rerouting in a computer network with path computation at an intermediate node
US8964540 *26 oct. 201224 févr. 2015Broadcom CorporationMethod and apparatus for dynamically allocating upstream bandwidth in passive optical networks
US20030219028 *23 mai 200227 nov. 2003International Business Machines CorporationApparatus, method and computer program to reserve resources in communications system
US20060274756 *17 juil. 20067 déc. 2006Cisco Technology, Inc.Modifying the bandwidth of an established ATM call in response to an identification of the contents of the call
US20070002888 *16 août 20064 janv. 2007International Business Machines CorporationApparatus Method and Computer Program to Reserve Resources in Communications System
US20070171825 *20 janv. 200626 juil. 2007Anagran, Inc.System, method, and computer program product for IP flow routing
US20070171826 *20 janv. 200626 juil. 2007Anagran, Inc.System, method, and computer program product for controlling output port utilization
US20080151746 *20 févr. 200726 juin 2008Jean-Philippe VasseurOptimization of distributed tunnel rerouting in a computer network with path computation at an intermediate node
US20080151756 *20 févr. 200726 juin 2008Jean-Philippe VasseurOptimization of distributed tunnel rerouting in a computer network with coordinated head-end node path computation
US20080151933 *20 févr. 200726 juin 2008Jean-Philippe VasseurOptimization of distributed tunnel rerouting in a computer network with intermediate node feedback
US20080198755 *20 févr. 200721 août 2008Jean-Philippe VasseurProbing-based mechanism to reduce preemption perturbation caused by higher priority tunnel establishment in a computer network
US20080212965 *18 avr. 20084 sept. 2008TeknovusMethod and apparatus for dynamically allocating upstream bandwidth in passive optical networks
US20110123194 *17 mai 201026 mai 2011Teknovus, Inc.Method and apparatus for dynamically allocating upstream bandwidth in passive optical networks
US20110231573 *28 mai 201022 sept. 2011Jean-Philippe VasseurDynamic directed acyclic graph (dag) adjustment
US20130051403 *26 oct. 201228 févr. 2013Broadcom CorporationMethod and Apparatus for Dynamically Allocating Upstream Bandwidth in Passive Optical Networks
DE10142372B4 *30 août 20013 mars 2005Siemens AgVorrichtung und Verfahren zum Wiederherstellen von Verbindungen in automatisch schaltbaren optischen Netzen
Classifications
Classification aux États-Unis370/351, 370/230
Classification internationaleH04L12/56, H04Q11/04
Classification coopérativeH04Q11/0478, H04L2012/562, H04L2012/5623, H04L2012/5634
Classification européenneH04Q11/04S2
Événements juridiques
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Owner name: CISCO SYSTEMS, INC., CALIFORNIA
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Owner name: CISCO TECHNOLOGY, INC., CALIFORNIA
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